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Disclosed are compounds of formula I as modulators of peroxisome proliferator activated receptors (PPARs) for the treatment of metabolic diseases such as obesity: wherein Ar1 is selected from the group consisting of a monocyclic heteroarornatic ring structure and a bicyclic heteroaromatic ring structure; Ar2 is selected from the group consisting of a monocyclic, a bicyclic, and a tricyclic carbocyclic aryl ring structure R1 is selected from the group consisting of alkyl, optionally substituted a five-membered or six-membered heteroarylring or a six-membered aryl ring, optionally substituted R2 is selected from the group consisting of hydrogen; alkyl, optionally substituted a five-membered or six-membered heteroaryl ring or a six-membered aryl ring, optionally substituted cyano; nitro; an amino; an amido; perhaloalkyl; and halogen; R3 is selected from the group consisting of hydrogen; alkyl, optionally substituted and B is a five-membered or six-membered heteroaryl ring, or -(CH2)j-C(O)OR4, wherein j is 0 or I 1 when Ar2 is a bicyclic or tricyclic carbocyclic ring structure and j is 1 when Ar2 is a monocyclic carbocyclic ring structure; and R4 is selected from the group consisting of hydrogen; alkyl, optionally substituted a five-membered or six-membered heteroaryl ring or a six-membered aryl ring, optionally substituted. The optional substituents are as defined in claim 1. (FIG). nil